Carl Icahn buys more Herbalife shares worth $18.5 million

According to a Friday filing, the billionaire investor purchased 306,846 shares on Aug. 31 at $60.39 per share, valuing the trade at more than $18.5 million.

The stock gained slightly in extended trading on light volume.

Last Friday, the chairman of Icahn Enterprises said he bought another 2.3 million shares of the nutritional supplement company. As of the most recent filing, Icahn’s total stake in Herbalife consists of more than 19.6 million shares.